The Blanco DECam bulge survey. I. The survey description and early results. Issue 2 (18th August 2020)
- Record Type:
- Journal Article
- Title:
- The Blanco DECam bulge survey. I. The survey description and early results. Issue 2 (18th August 2020)
- Main Title:
- The Blanco DECam bulge survey. I. The survey description and early results
- Authors:
- Rich, R Michael
Johnson, Christian I
Young, Michael
Simion, Iulia T
Clarkson, William I
Pilachowski, Catherine
Michael, Scott
Kunder, Andrea
Katherina Vivas, A
Koch, Andreas
Marchetti, Tommaso
Ibata, Rodrigo
Martin, Nicolas
Robin, Annie C
Lagarde, Nadége
Collins, Michelle
Ivezić, Željko
de Propris, Roberto
Shen, Juntai
Gerhard, Ortwin
Soto, Mario - Abstract:
- ABSTRACT: The Blanco Dark Energy Camera (DECam) Bulge survey is a Vera Rubin Observatory (LSST) pathfinder imaging survey, spanning ∼200 deg 2 of the Southern Galactic bulge, −2° < b < −13° and −11° < l < +11°. We have employed the CTIO-4 m telescope and the DECam to image a contiguous ∼200 deg 2 region of the relatively less reddened Southern Galactic bulge, in SDSS u + Pan-STARRS grizy . Optical photometry with its large colour baseline will be used to investigate the age and metallicity distributions of the major structures of the bulge. Included in the survey footprint are 26 globular clusters imaged in all passbands. Over much of the bulge, we have Gaia DR2 matching astrometry to i ∼ 18, deep enough to reach the faint end of the red clump. This paper provides the background, scientific case, and description of the survey. We present an array of new reddening-corrected colour–magnitude diagrams that span the extent of Southern Galactic bulge. We argue that a population of massive stars in the blue loop evolutionary phase, proposed to lie in the bulge, are instead at ∼2 kpc from the Sun and likely red clump giants in the old disc. A bright red clump near ( l, b ) = (+ 8°, −4°) may be a feature in the foreground disc, or related to the long bar reported in earlier work. We also report the first map of the blue horizontal branch population spanning the Blanco DECam Bulge Survey field of regard, and our data do not confirm the reality of a number of proposed globularABSTRACT: The Blanco Dark Energy Camera (DECam) Bulge survey is a Vera Rubin Observatory (LSST) pathfinder imaging survey, spanning ∼200 deg 2 of the Southern Galactic bulge, −2° < b < −13° and −11° < l < +11°. We have employed the CTIO-4 m telescope and the DECam to image a contiguous ∼200 deg 2 region of the relatively less reddened Southern Galactic bulge, in SDSS u + Pan-STARRS grizy . Optical photometry with its large colour baseline will be used to investigate the age and metallicity distributions of the major structures of the bulge. Included in the survey footprint are 26 globular clusters imaged in all passbands. Over much of the bulge, we have Gaia DR2 matching astrometry to i ∼ 18, deep enough to reach the faint end of the red clump. This paper provides the background, scientific case, and description of the survey. We present an array of new reddening-corrected colour–magnitude diagrams that span the extent of Southern Galactic bulge. We argue that a population of massive stars in the blue loop evolutionary phase, proposed to lie in the bulge, are instead at ∼2 kpc from the Sun and likely red clump giants in the old disc. A bright red clump near ( l, b ) = (+ 8°, −4°) may be a feature in the foreground disc, or related to the long bar reported in earlier work. We also report the first map of the blue horizontal branch population spanning the Blanco DECam Bulge Survey field of regard, and our data do not confirm the reality of a number of proposed globular clusters in the bulge. … (more)
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 499:Issue 2(2020)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 499:Issue 2(2020)
- Issue Display:
- Volume 499, Issue 2 (2020)
- Year:
- 2020
- Volume:
- 499
- Issue:
- 2
- Issue Sort Value:
- 2020-0499-0002-0000
- Page Start:
- 2340
- Page End:
- 2356
- Publication Date:
- 2020-08-18
- Subjects:
- surveys -- Hertzsprung-Russel and colour-magnitude diagrams -- Galaxy: bulge -- globular clusters
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/staa2426 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 15145.xml